The scott mitchel series in http://www.asp.net/learn/data-access/ does not give the modeling and designing guidelines for the DALs and BLLs

There is this document from 2002
Designing Data Tier Components and Passing Data Through Tiers
http://msdn2.microsoft.com/en-us/library/ms978496.aspx

But I guess that s outdated, I need something that goes along with VS2005